Children with ADHD are more likely to succeed in cognitive tasks when
they are fidgeting. Rather than telling them to stop, is it time to let
them squirm in class?

The results, from a small study of teens and pre-teens, add to
growing evidence that movement may help children with attention-deficit
hyperactivity disorder to think.

One of the theories about ADHD is that the brain is somehow
under-aroused. Physical movements could help wake it up or maintain
alertness, perhaps by stimulating the release of brain-signalling
chemicals like dopamine or norepinephrine.